I edited that comment probably while you were replying, already addressed that and mentioned I made a small but somewhat irrelevant mistake with my paraphrasing of the history of the rune. I'll copy what I had to say about that to this comment too and just put the corrected history below.
Don't let the "Bugfix" tag below fool you, this is a pretty substantial power-down to Hail of Blades Jhin. Bonus attack speed increases both Jhin's attack damage and the movement speed he gets from critical strikes, so while most champions would be relatively unimpacted by Hail of Blades' 75-125% bonus attack speed buffing their first basic attack, Jhin's been reaping real benefits from the bug.
A champion whose kit likes a rune more will lose more when a bug that made it apply earlier than it should is fixed, so it makes sense to announce that it acts as a nerf.
Corrected history:
8.11: Hail of blades is added.
8.20: Jhin now gets hail of blades' as towards his ad on 2-3-4, but still gets it towards his ms on 1-2-3.
8.22: Another bugfix, Jhin now gets the ms on 2-3-4, like everyone else, everything is good.
Later: Hail of blades is changed to benefit 1-2-3, but they forget about Jhin, and he only gets the benefit on 2-3.
The devs made it the way that it is on purpose. You've been relentlessly arguing a point that has already been opened and closed.
No. They. Did. Not. Jhin is intended to benefit on from hail of blades for three of his attacks, period, and anything that contradicts that is wrong. First, they showed it by continuing to have him benefit from it on the normal number of attacks through every documented change. Second, they said it explicitly in 8.22:
FOUR Fixed a bug where Jhin was NOT getting an empowered haste off his third Hail of Blades attack
If you still fail to understand that jhin getting the benefit on only two attacks is a bug, or you insist it should be intended because it suits your sense of balance, we're done here. If not, and I hope not, we'll go from there.